[ncarg-talk] [6.4.0 version] Bug : Categorical Snow always null

[Mary Haley]

Hi Sébastien,

Sorry I didn't respond sooner.  I was at a conference.

Thanks for providing a small file that clearly shows the problem.

I have submitted a ticket on this, NCL-2712, and put a high priority on it.

You are correct that it appears to be setting all the 1s to 0s. This is
very puzzling. I will see if we can look at this soon.

--Mary



On Tue, Jan 9, 2018 at 4:24 AM, Sébastien POITEVIN <
sebastien.poitevin at meteoconsult.com> wrote:

> Dear Mary,
>
> Thanks for your help.
>
>  Find in attached, WRF-NMM grib file and, below, asked informations :
>
>
>
>    1. No error return with ncl_filedump
>    2.
>
>
> *printVarSummary(csnow) : Variable: csnowType: floatTotal Size: 1443112
>    bytes            360778 valuesNumber of Dimensions: 2Dimensions and sizes:
>     [g0_lat_0 | 529] x [g0_lon_1 | 682]Coordinates:            g0_lat_0:
>    [53.012..39.787]            g0_lon_1: [-6.01..11.722]Number Of Attributes:
>    12  center :      US National Weather Service - NCEP (WMC)  long_name :
>     Categorical snow  units :       yes=1;no=0  _FillValue :  1e+20
>    level_indicator :     1  gds_grid_type :       0  parameter_table_version
>    :     2  parameter_number :    143  model :       North Pacific Hurricane
>    Wave Model  forecast_time :       18  forecast_time_units : hours
>    initial_time :        01/08/2018 (18:00) *
>    3.
> *printMinMax(csnow,0) *
>    (0)     Categorical snow: min=0   max=0
>
>    4.
>
>
> *print(num(ismissing(csnow))) (0)     61086 *
>
>
> 2018-01-08 17:16 GMT+01:00 Mary Haley <haley at ucar.edu>:
>
>> ​Dear Sebastien,
>>
>> In the future please post NCL questions / issues to ncl-talk at ucar.edu.
>> The ncarg-talk at ucar.edu email list is for NCAR Graphics users, and is
>> not an active group.
>>
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>> ​Without having access to the dataset, it is hard for us to debug this
>> problem. It would help, then, if you could provide more information about
>> the variable, like what kind of metadata it has.
>>
>> Do you get any kind of error from ncl_filedump?
>>
>> Could you run the short NCL script below, and send me the output from
>> running it, using both NCL V6.3.0 and V6.4.0, including any error messages:
>>
>> a = addfile("20122017_15.grb","r")
>> csnow = a->CSNOW_GDS0_SFC
>> printVarSummary(csnow)
>> printMinMax(csnow,0)
>> print(num(ismissing(csnow)))
>>
>> Finally, is there some place we can download this file, or a similar
>> one,  from?
>>
>> Thanks,
>>
>> --Mary
>>
>> On Wed, Jan 3, 2018 at 1:49 AM, Sébastien POITEVIN <
>> sebastien.poitevin at meteoconsult.com> wrote:
>>
>>> Hi all,
>>>
>>> When we read "Categorical Snow" with NCL 6.4.0 version (ncl_filedump -v
>>> CSNOW_GDS0_SFC 20122017_15.grb or with 'PrintMinMax' command), we have
>>> always null value (min and max value = 0)  whereas we have no problem when
>>> we read the same grib file with the 6.3.0 version (min = 0 and max = 1).
>>>
>>> Grib files are produced by WRF-NMM (version V3.7.1) and UPPV3.0.
>>>
>>> Our system is "3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u5
>>> (2017-09-19) x86_64 GNU/Linux"
>>>
>>> Unfortunately I cannot send you a WRF grib file because it is too large.
>>>
>>> Thanks for your help.
>>>
>>> --
>>>
>>> _______________________________________________
>>> ncarg-talk mailing list
>>> ncarg-talk at ucar.edu
>>> http://mailman.ucar.edu/mailman/listinfo/ncarg-talk
>>>
>>>
>>
>
>
> --
>
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